Billy O'Neal 403c952a0c
Clean the downloads directory every CI run. (#19311)
Now that vcpkg has artifact caching, meaning downloading artifacts usually doesn't have to leave the datacenter, there's no need to potentially dirty different runs with leftover downloads from each other.

This resulted in some "impossible" results in https://github.com/microsoft/vcpkg/pull/18687 where a previous PR run accidentially downloaded the Windows version of nodejs to /mnt/vcpkg-ci/downloads/node-v14.17.4-linux-x64.tar.xz
2021-08-02 14:15:48 -07:00
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